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SubjectRe: fairsched + O(1) process scheduler
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On Wed, 2003-04-02 at 17:07, Antonio Vargas wrote:

> Hmmm, we had some way for executing code just after an interrupt,
> but outside interrupt scope... was it a bottom half? Can you
> point me to some place where it's done?

Unfortunately uidhash_lock cannot be used from a bottom half either.

You can push it into a work queue. See schedule_work() and the default
events queue.

> Ok, I did know m68k can do it, but wasn't sure about all other arches :)

Yep. Everyone architecture I know of - and certainly all that Linux
support - can do atomic read/writes to a word. Thinking about it, it
would be odd if not (two writes to a single word interleaving?). There
are places this assumption is used.

Anything more complicated, of course, needs atomic operations or locks.

Robert Love

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